<template>
	<view class="uni-stat__select">
		<span
			v-if="label"
			class="uni-label-text hide-on-phone"
			>{{ label + '：' }}</span
		>
		<view
			class="uni-stat-box"
			:class="{ 'uni-stat__actived': current }"
		>
			<view
				class="uni-select"
				:class="{ 'uni-select--disabled': disabled }"
			>
				<view
					class="uni-select__input-box"
					@click="toggleSelector"
				>
					<view
						class="select-item-list"
						v-if="currentList.length > 0"
					>
						<view
							class="select-item"
							:key="item.value"
							v-for="(item, index) in currentList"
						>
							<view class="item-text">{{ item[map.text] }}</view>
							<uni-icons
								type="closeempty"
								size="16"
								color="#999"
								@click="onDeleteItem(index)"
							></uni-icons>
						</view>
					</view>
					<view
						v-else
						class="uni-select__input-text uni-select__input-placeholder"
						>{{ placeholder }}</view
					>
				</view>
				<view
					class="uni-select--mask"
					v-if="showSelector"
					@click="toggleSelector"
				/>
				<view
					class="uni-select__selector"
					v-if="showSelector"
				>
					<view class="uni-popper__arrow"></view>
					<scroll-view
						scroll-y="true"
						class="uni-select__selector-scroll"
					>
						<view
							class="uni-select__selector-empty"
							v-if="mixinDatacomResData.length === 0"
						>
							<text>{{ emptyTips }}</text>
						</view>
						<view
							v-else
							class="uni-select__selector-item"
							v-for="(item, index) in mixinDatacomResData"
							:key="index"
							@click="change(item)"
						>
							<text
								:class="{
									'uni-select__selector__disabled': item.disable,
									'uni-select__selector-selected': getCurrentSelected(item),
								}"
								>{{ formatItemName(item) }}</text
							>
							<uni-icons
								type="checkmarkempty"
								size="16"
								color="#007aff"
								v-if="getCurrentSelected(item)"
							></uni-icons>
						</view>
					</scroll-view>
					<view class="select-bottom-bar"
						><text @click="showSelector = false">关闭</text></view
					>
				</view>
			</view>
		</view>
	</view>
</template>

<script>
import uniIcons from '../../uni_modules/uni-icons/components/uni-icons/uni-icons.vue';
/**
 * DataChecklist 数据选择器
 * @description 通过数据渲染的下拉框组件
 * @tutorial https://uniapp.dcloud.io/component/uniui/uni-data-select
 * @property {String} value 默认值
 * @property {Array} localdata 本地数据 ，格式 [{text:'',value:''}]
 * @property {Boolean} clear 是否可以清空已选项
 * @property {Boolean} emptyText 没有数据时显示的文字 ，本地数据无效
 * @property {String} label 左侧标题
 * @property {String} placeholder 输入框的提示文字
 * @property {Boolean} disabled 是否禁用
 * @event {Function} change  选中发生变化触发
 */

export default {
	components: { uniIcons },
	name: 'xh-multiple-select',
	mixins: [uniCloud.mixinDatacom || {}],
	props: {
		map: {
			type: Object,
			default() {
				return {
					text: 'text',
					value: 'value',
				};
			},
		},
		placeholder: {
			type: String,
			default: '请选择内容',
		},
		localdata: {
			type: Array,
			default() {
				return [];
			},
		},
		value: {
			type: Array,
			default() {
				return [];
			},
		},
		modelValue: {
			type: Array,
			default() {
				return [];
			},
		},
		label: {
			type: String,
			default: '',
		},
		placeholder: {
			type: String,
			default: '请选择',
		},
		emptyTips: {
			type: String,
			default: '无选项',
		},
		clear: {
			type: Boolean,
			default: true,
		},
		defItem: {
			type: Number,
			default: 0,
		},
		disabled: {
			type: Boolean,
			default: false,
		},
		// 格式化输出 用法 field="_id as value, version as text, uni_platform as label" format="{label} - {text}"
		format: {
			type: String,
			default: '',
		},
	},
	data() {
		return {
			showSelector: false,
			current: '',
			currentList: [],
			mixinDatacomResData: [],
			apps: [],
			channels: [],
			cacheKey: 'uni-data-select-lastSelectedValue',
		};
	},
	created() {
		this.debounceGet = this.debounce(() => {
			this.query();
		}, 300);
		if (this.collection && !this.localdata.length) {
			this.debounceGet();
		}
	},
	computed: {
		typePlaceholder() {
			const text = {
				'opendb-stat-app-versions': '版本',
				'opendb-app-channels': '渠道',
				'opendb-app-list': '应用',
			};
			const common = this.placeholder;
			const placeholder = text[this.collection];
			return placeholder ? common + placeholder : common;
		},
	},
	watch: {
		localdata: {
			immediate: true,
			handler(val, old) {
				if (Array.isArray(val) && old !== val) {
					this.mixinDatacomResData = val;
				}
			},
		},
		value(val, old) {
			this.initDefVal();
		},
		mixinDatacomResData: {
			immediate: true,
			handler(val) {
				if (val.length) {
					this.initDefVal();
				}
			},
		},
	},
	methods: {
		getCurrentSelected(currentItem) {
			return this.currentList
				.map((item) => item[this.map.value])
				.includes(currentItem[this.map.value]);
		},
		// 删除选中项
		onDeleteItem(index) {
			this.currentList.splice(index, 1);
			this.emit(this.currentList);
		},
		debounce(fn, time = 100) {
			let timer = null;
			return function (...args) {
				if (timer) clearTimeout(timer);
				timer = setTimeout(() => {
					fn.apply(this, args);
				}, time);
			};
		},
		// 执行数据库查询
		query() {
			this.mixinDatacomEasyGet();
		},
		// 监听查询条件变更事件
		onMixinDatacomPropsChange() {
			if (this.collection) {
				this.debounceGet();
			}
		},
		initDefVal() {
			this.currentList = this.mixinDatacomResData.filter((item) =>
				this.value.includes(item[this.map.value])
			);
		},

		/**
		 * @param {[String, Number]} value
		 * 判断用户给的 value 是否同时为禁用状态
		 */
		isDisabled(value) {
			let isDisabled = false;

			this.mixinDatacomResData.forEach((item) => {
				if (item.value === value) {
					isDisabled = item.disable;
				}
			});

			return isDisabled;
		},

		clearVal() {
			this.emit([]);
			if (this.collection) {
				this.removeCache();
			}
		},
		change(item) {
			if (!item.disable) {
				// this.showSelector = false;
				const index = this.currentList.findIndex(
					(cItem) => cItem[this.map.value] === item[this.map.value]
				);
				if (index === -1) {
					this.currentList.push(item);
				} else {
					this.onDeleteItem(index);
				}

				this.emit(this.currentList);
			}
		},
		emit(list = []) {
			const vals = list.map((c) => c[this.map.value]);
			this.$emit('input', vals);
			this.$emit('update:modelValue', vals);
			this.$emit('change', list);
			if (this.collection) {
				this.setCache(vals);
			}
		},
		toggleSelector() {
			if (this.disabled) {
				return;
			}

			this.showSelector = !this.showSelector;
		},
		formatItemName(item) {
			let { value, channel_code } = item;
			let text = item[this.map.text];
			channel_code = channel_code ? `(${channel_code})` : '';

			if (this.format) {
				// 格式化输出
				let str = '';
				str = this.format;
				for (let key in item) {
					str = str.replace(new RegExp(`{${key}}`, 'g'), item[key]);
				}
				return str;
			} else {
				return this.collection.indexOf('app-list') > 0
					? `${text}(${value})`
					: text
					? text
					: `未命名${channel_code}`;
			}
		},
		// 获取当前加载的数据
		getLoadData() {
			return this.mixinDatacomResData;
		},
		// 获取当前缓存key
		getCurrentCacheKey() {
			return this.collection;
		},
		// 获取缓存
		getCache(name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			return cacheData[name];
		},
		// 设置缓存
		setCache(value, name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			cacheData[name] = value;
			uni.setStorageSync(this.cacheKey, cacheData);
		},
		// 删除缓存
		removeCache(name = this.getCurrentCacheKey()) {
			let cacheData = uni.getStorageSync(this.cacheKey) || {};
			delete cacheData[name];
			uni.setStorageSync(this.cacheKey, cacheData);
		},
	},
};
</script>

<style lang="scss" scoped>
$uni-base-color: #6a6a6a !default;
$uni-main-color: #333 !default;
$uni-secondary-color: #909399 !default;
$uni-border-3: #e5e5e5;

/* #ifndef APP-NVUE */
@media screen and (max-width: 500px) {
	.hide-on-phone {
		display: none;
	}
}

/* #endif */
.uni-stat__select {
	display: flex;
	align-items: center;
	// padding: 15px;
	/* #ifdef H5 */
	cursor: pointer;
	/* #endif */
	width: 100%;
	flex: 1;
	box-sizing: border-box;
}

.uni-stat-box {
	width: 100%;
	flex: 1;
}

.uni-stat__actived {
	width: 100%;
	flex: 1;
	// outline: 1px solid #2979ff;
}

.uni-label-text {
	font-size: 14px;
	font-weight: bold;
	color: $uni-base-color;
	margin: auto 0;
	margin-right: 5px;
}

.uni-select {
	font-size: 14px;
	box-sizing: border-box;
	position: relative;
	/* #ifndef APP-NVUE */
	display: flex;
	user-select: none;
	/* #endif */
	flex-direction: row;
	align-items: center;
	width: 100%;

	&--disabled {
		background-color: #f5f7fa;
		cursor: not-allowed;
	}
}

.uni-select__label {
	font-size: 16px;
	// line-height: 22px;
	height: 35px;
	padding-right: 10px;
	color: $uni-secondary-color;
}

.uni-select__input-box {
	position: relative;
	display: flex;
	flex: 1;
	min-height: 40px;
	flex-direction: row;
	align-items: center;
	border: 1px solid #dcdfe6;
	border-radius: 4px;
}

.uni-select__input {
	flex: 1;
	font-size: 14px;
	height: 22px;
	line-height: 22px;
}

.uni-select__input-plac {
	font-size: 14px;
	color: $uni-secondary-color;
}

.uni-select__selector {
	/* #ifndef APP-NVUE */
	box-sizing: border-box;
	/* #endif */
	position: absolute;
	top: calc(100% + 12px);
	left: 0;
	width: 100%;
	background-color: #ffffff;
	border: 1px solid #ebeef5;
	border-radius: 6px;
	box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
	z-index: 3;
	padding: 4px 0;
}

.uni-select__selector-scroll {
	/* #ifndef APP-NVUE */
	max-height: 200px;
	box-sizing: border-box;
	/* #endif */
}

/* #ifdef H5 */
@media (min-width: 768px) {
	.uni-select__selector-scroll {
		max-height: 600px;
	}
}

/* #endif */

.uni-select__selector-empty,
.uni-select__selector-item {
	/* #ifndef APP-NVUE */
	display: flex;
	cursor: pointer;
	/* #endif */
	line-height: 35px;
	font-size: 14px;
	text-align: center;
	/* border-bottom: solid 1px $uni-border-3; */
	padding: 0px 10px;
	justify-content: space-between;
}

.uni-select__selector-item:hover {
	background-color: #f9f9f9;
}

.uni-select__selector-empty:last-child,
.uni-select__selector-item:last-child {
	/* #ifndef APP-NVUE */
	border-bottom: none;
	/* #endif */
}

.uni-select__selector__disabled {
	opacity: 0.4;
	cursor: default;
}

.uni-select__selector-selected {
	color: $uni-color-primary;
}

/* picker 弹出层通用的指示小三角 */
.uni-popper__arrow,
.uni-popper__arrow::after {
	position: absolute;
	display: block;
	width: 0;
	height: 0;
	border-color: transparent;
	border-style: solid;
	border-width: 6px;
}

.uni-popper__arrow {
	filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
	top: -6px;
	left: 10%;
	margin-right: 3px;
	border-top-width: 0;
	border-bottom-color: #ebeef5;
}

.uni-popper__arrow::after {
	content: ' ';
	top: 1px;
	margin-left: -6px;
	border-top-width: 0;
	border-bottom-color: #fff;
}

.uni-select__input-text {
	// width: 280px;
	width: 100%;
	color: $uni-main-color;
	white-space: nowrap;
	text-overflow: ellipsis;
	-o-text-overflow: ellipsis;
	overflow: hidden;
}

.uni-select__input-placeholder {
	color: $uni-base-color;
	font-size: 12px;
	padding-left: 10px;
}

.uni-select--mask {
	position: fixed;
	top: 0;
	bottom: 0;
	right: 0;
	left: 0;
	z-index: 2;
}

.select-item-list {
	display: flex;
	flex-wrap: wrap;
	padding-top: 5px;
	padding-left: 5px;
}
.select-item {
	padding: 5px;
	border: $uni-border-color;
	background: #e5e3e3;
	margin-right: 5px;
	margin-bottom: 5px;
	display: inline-flex;
	align-items: center;
	.item-text {
		display: flex;
		align-items: center;
	}
}
.select-bottom-bar {
	display: flex;
	justify-content: center;
	padding: 10px 10px 6px 10px;
	border-top: 1px solid $uni-border-color;
}
</style>
